Presumably the optimal solution would be to prepare fake but easily executed plans (tuned to appeal to whoever's on the committee) to go with your fake numbers. But probably no amount of regulating police will help if your regulators are also chasing metrics (say, to make themselves look better than their opponent for voters).

Random sampling is one effective (if adversarial) way to validate numbers. For policing I guess that looks like "secret citizens" reporting crimes and sending the results back up the chain? But that doesn't solve the second half of the problem.